Exception on Hibernate

[SonxQ7]

Hi, trying to understand this exception.. Happened after i removed and the jar files

2008/09/10 02:08:41 org.slf4j.impl.JCLLoggerAdapter info
INFO: Hibernate 3.3.0.SP1
2008/09/10 02:08:41 org.slf4j.impl.JCLLoggerAdapter info
INFO: hibernate.properties not found
2008/09/10 02:08:41 org.slf4j.impl.JCLLoggerAdapter info
INFO: Bytecode provider name : javassist
2008/09/10 02:08:41 org.slf4j.impl.JCLLoggerAdapter info
INFO: using JDK 1.4 java.sql.Timestamp handling
2008/09/10 02:08:41 org.slf4j.impl.JCLLoggerAdapter info
INFO: configuring from resource: /hibernate.cfg.xml
2008/09/10 02:08:41 org.slf4j.impl.JCLLoggerAdapter info
INFO: Configuration resource: /hibernate.cfg.xml
2008/09/10 02:08:42 org.slf4j.impl.JCLLoggerAdapter info
INFO: Reading mappings from resource : com/genuitec/hibernate/PhoneNumber.hbm.xml
2008/09/10 02:08:42 org.slf4j.impl.JCLLoggerAdapter info
INFO: Mapping class: com.genuitec.hibernate.PhoneNumber -> SNX_PHONE_NUMBERS
2008/09/10 02:08:42 org.slf4j.impl.JCLLoggerAdapter info
INFO: Reading mappings from resource : com/genuitec/hibernate/User.hbm.xml
2008/09/10 02:08:42 org.slf4j.impl.JCLLoggerAdapter info
INFO: Mapping class: com.genuitec.hibernate.User -> SNX_USERS
2008/09/10 02:08:42 org.slf4j.impl.JCLLoggerAdapter info
INFO: Configured SessionFactory: null
2008/09/10 02:08:42 org.slf4j.impl.JCLLoggerAdapter info
INFO: Mapping collection: com.genuitec.hibernate.User.phoneNumbers -> SNX_PHONE_NUMBERS
Exception in thread "main" java.lang.AbstractMethodError: org.slf4j.impl.JCLLoggerAdapter.isTraceEnabled()Z
	at org.hibernate.type.NullableType.<clinit>(NullableType.java:59)
	at org.hibernate.Hibernate.<clinit>(Hibernate.java:103)
	at org.hibernate.type.TypeFactory.<clinit>(TypeFactory.java:69)
	at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:283)
	at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:276)
	at org.hibernate.mapping.Property.isValid(Property.java:207)
	at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:458)
	at org.hibernate.mapping.RootClass.validate(RootClass.java:215)
	at org.hibernate.cfg.Configuration.validate(Configuration.java:1135)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1320)
	at com.genuitec.hibernate.client.TestClient.openSession(TestClient.java:30)
	at com.genuitec.hibernate.client.TestClient.main(TestClient.java:160)